Specifies the value to store in the Differentiated
Services (DS) Field in the IP packet used to
encapsulate the ping probe. The DS Field is defined
as the Type of Service (TOS) octet in a IPv4 header
or as the Traffic Class octet in a IPv6 header.
The value of this object must be a decimal integer
in the range from 0 to 255. This option can be used
to determine what effect an explicit DS Field setting
has on a ping response. Not all values are legal or
meaningful. A value of 0 means that the function
represented by this option is not supported. DS Field
usage is often not supported by IP implementations and
not all values are supported. Refer to RFC 2474 for
guidance on usage of this field.